Lubricating oil compositions of mono-(bis) hydrocarbonthiophosphonoxyhydroxyalkyl hydrocarbylamines d# 59443-4d1



United States Patent 3,259,580 LUBRICATING OIL COMPOSITIONS OF MONO- (BIS)HYDROCARBONTHIOPHOSPHONOXYHY- DROXYALKYL HYDROCARBYLAMINES D# 59,443-4D1 James M. Petersen, Fishkill, N.Y., Herman D. Kluge, deceased, late of Fishkill, N .Y., by Hazel E. Kluge, administratrix, Fishkill, N.Y., and David 1). Reed, Glenham, N.Y., assignors to Texaco Inc., New York, N.Y., a corporation of Delaware No Drawing. Original application Oct. 18, 1962, Ser. No. 233,180, now Patent No. 3,201,441, dated Aug. 17, 1965. Divided and this application Feb. 16, 1965, Ser. No. 439,122

6 Claims. (Cl. 252-46.7)

This is a division of Serial No. 233,180, filed October 18, 1962, now US. 3,201,441.

This invention relates to novel lubricating oil compositions containing reaction products of epoxyalkylhydrocarbylamine and hydrocarbon thiophosphonic acids. More particularly, the subject invention pertains to mono- (bis) hydrocarbonthiophosphonoxyhydroxyalkyl hydrocarbonamine containing lubricating compositionsr The mono-(or bis-) hydrocarbonthiophosphonoxyhydroxyalkyl hydrocarbylamines of this invention, hereafter known for the sake of brevity as thiophosphonoxy hydrocarbylamines, are represented by the formula:

R1 R2 lawman...) ()H OH y Where R is alkyl, aryl, alkaryl or aralkyl of from 1 to 20 carbons, R and R are hydrogen or alkyl radicals of from 1 to 6 carbons, R is hydrocarbyl (monovalent hydrocarbon radical), X is sulfur or a mixture of oxygen and sulfur and y is an integer from 1 to 2, inclusively.

The thiophosphonoxy hydrocarbylamines of this invention are useful as detergent, dispersant and thermal stability additives for lubricating oils and fuels, e.g., mineral oil, synthetic ester oils, and jet fuels.

Broadly, the thiophosphonoxy hydrocarbylamines are prepared by the reaction of epoxyalkylhydrocarbylamine with a hydrocarbonthiophosphonic acid.

PREPARATION OF THE THIOPHOSPHONIC ACID REACTANT The thiophosphonic acid is prepared by hydrolyzing a hydrocarbon-P 8 reaction product. As is known, hydrocarbon-P 8 reaction products are formed by the reaction of aromatic hydrocarbons, cycloaliphatic hydrocarbons and aliphatic hydrocarbons with P 5 at elevated temperatures. Although a wide variety of hydrocarbons such as aliphatic-substituted aryl compounds and aryl-substituted aliphatic compounds are usable as the hydrocarbon reactant, olefins are generally employed as the hydrocarbon reactant. Lubricating oil fractions constitute another preferred class of materials for reaction with P 8 to form a product which after further treatment as outlined below is converted to the thiophosphonic acid. Olefin fractions obtained by cracking of high molecular Weight hydrocarbon fractions may also be used as the hydrocarbon reactant.

The olefinic hydrocarbons reacted with P 8 usually contain at least 12 carbon atoms although lower molecular weight olefins can be employed. 'Monoolefin polymers such as isobutylene polymer, butylene polymer, propylene polymer and copolymers of monoolefin such as propyleneisobutylene copolymer are preferred materials for reaction wih P 8 In general monoolefin polymers and copolymers having an average molecular Weight between about 250 and 50,000 are employed with polymers and copolymers having an average molecular. weight in the 3,259,580 Patented July 5, 1966 at a temperature of from about IOU-320 C. in an inert atmosphere, for example, under a blanket of ntirogen, is treated at a temperature between about and 260 C. by contact with steam. Steam treatment hydrolyzes the hydrocarbon-P 8 reaction product to a hydrocarbonthiophosphonic acid and inorganic phosphorus acids. The hydrocarbonthiophosphonic acid has the general formula:

wherein R is hydrocarbyl radical derived from the hydrocarbon reacted with P 8 R is usually an olefinic radical containing 20 to 200 carbon atoms and X is sulfur or a mixture of oxygen and sulfur; X in the above formula is designated as sulfur or a mixture of sulfa and oxygen because the steam hydrolysis step usually results in the replacement of a portion of the sulfur joined to the phosphorus with oxygen.

The inorganic phosphorus acids formed during hydrolysis are removed prior to reaction of the thiophosphonic acid with the epoxyalkylhydrocarbylamine reactent Nos. 2,951,835 and 2,987,512, removal of the inorremoval of the inorganic phosphorus acids. In US. Patent Nos. 2,951,835 and 2,987,512, remroval of the inorganic phosphorus acids is affected by contact with synthetic hydrous alkali metal silicates and synthetic hydrous alkaline earth metal silicates, respectively. Commonlyassigned, copending application, Serial No. 841,668, filed September 23, 1959 by H. D. Kluge and R. O. Lacoste, now US. Patent No. 3,135,729; describes a process wherein inorganic phosphorus acids are removed from the hydrolyzed product by extraction with anhydrous methanol.

EPOXYALKYLHYDROCARBYLAMINE The epoxyalkylhydrocarbylamine reactant which reacts with the hydrocarbonthiophosphonic acid to form the novel thiophosphonoxy hydrocrabylamines are represented by the general formula:

where R and R are hydrogen or an alkyl of from 1 to 6 carbons, R is hydrocarbyl of from 1 to 20 carbons selected PREPARATION OF THE NOVEL THIOPHOS- PHONOXY HY DROCARBYLAMINE Reaction of the epoxyalkylhydrocarbylamine with hy-- drocarbonthiophosphonic acid to produce the thiophosphonoxy hydrocarbylamines of the invention is efl ected' at a temperature between about 25 and C. and at an epoxide to acid reactant mole ratio of between about 07:1 and 2:1. Atmospheric, superatmospheric and subatmospheric pressure may be employed with atmospheric pressure being preferred.

LUBRICANTS CONTAINING THE NOVEL THIO- PHOSPHONOXY HYDROCARBYLAMINES In lubricating oil compositions containing the hydrocar-bylamines of the invention, hydrocarbon mineral oil may be employed as base materials such as paratfin base, naphthene base, mixed paraffin base distillate or residual oils. Parafiin base distillate lubricating oil fractions are used in the formulation of premium grade motor oil such as are contemplated in this invention. The lubricating mineral oil base generally has been subjected to solvent refining to improve its lubricity and viscosity-temperature relationship as well as solvent dewaxing to remove waxy components and improve the pour of the oil. Broadly speaking, a mineral lubricating oil having an SUS viscosity at 100 F. .between 50 and 1,000 may be used in the formulation of the improved lubrication of this invention. Usually the viscosity range falls between 70 and 300 at 100 The mineral lubricating oils containing the thiophosphonoxy hydrocarbylamines may contain other additives designed to impart other desirable properties thereto. For example, V.I. improvers such as polymethacrylates are normally included therein as are corrosion inhibitors and other detergents.

A widely used V.I. improver is a polymethacrylate of the general formula:

wherein R is an aliphatic radical of from 1 to 20 carbons and m is an integer of from 600 to 35,000.

One commonly used supplementary detergent is a alkaline earth metal alkylphenolate. Barium nouylphenolate, barium dodecylcresolate and calcium dodecylphenolate are examples of such detergents. These products are usually present in the lubricating oil in a con ceutration between 0.1 and wt. percent.

An often used inhibitor and antioxidant is a divalent metal alkyl dithiophosphate resulting from neutralization of a P S -alcol1ol reactant product with a divalent metal or divalent metal oxide. Barium and zinc alkyl dit-hiophosphates are the most widely used oxidation and corrosion inhibitors. Metal dialkyl dithiophosphate are usually present in the lubricant in a concentration between 0.1 and 3 wt. percent.

Synthetic lubricating bases of the ester or ether type may be alternatively used as the lubricating base oil. High molecular weight high boiling liquid aliphatic dicarboxylic esters possess excellent viscosity-temperature relationships and lubricating properties and are finding increasing utilization in lubricating oils adapted for high and low temperature lubrication. For example, esters of this type are used in the formulation of jet engine oils.

The thiophosphonoxy hydrocarbylamines are present in lubricating oils in concentrations sufiicient toimpart dispersant properties thereto. In concentrates used in the formulation of finished lubricants, the concentration of thiophosphonoxy hydrocarbylamine can be as high as 50%. In finished lubricants the concentration of the additive falls between 0.2 and wt. percent with a concentration of between 1 and 5 wt. percent normally employed.

Examples of the thiophosphonoxy hydrocarbylamines contemplated herein are 3-polybutene(940 M.W.)thiophosphonoxy-2 hydroxypropyldiethylamine; N,N bis- (3-polybutene(940 M.W.)thiophosphonoxy 2 hydroxypropyllbutylamine; N,N 'bis(3 polybutene(940 M.W.) thiophosphonoxy-Z-hydroxypropyl)aniline; 3-p0lybutene (1500 M.W.)thiophosphonoxy-2,3-dimethyl 2 hydroxypropyl ditolylamine and 3-polymethy1ene(l700 M.W.) thiophosphonoxy-3-ethyl-2-hydroxypropyl dibenzylamine.

Example I below illustrates the preparation of the hydrocarbonthiophosphonic acid from polybutene, P 8 and water. Examples II to V illustrates the preparation of the thiophosphonoxy hydrocarbylamine of the invention from the thiophosphonic acid prepared by the method described in Example I. Example VI illustrates lubricant additive properties of the thiophosphonoxy hydrocarbylamines and lubricant compositions containing said additive.

Example I A polybutene-P S reaction product was prepared by reacting polybutene having an average molecular weight of about 940 with P 3 at a temperature of 232 C., in a mole ratio of polybutene to P 8 of 1.111 and in the presence of sulfur in an amount equal to 0.5 wt. percent of the polybutene for a period of 4 hours. The reaction product was diluted with approximately 150 wt. percent of a naphthene base oil having an SUS viscosity at F. of 100, steamed at 176 C. for 10 hours in a nitrogen atmosphere and then dried by the passage of nitrogen therethrough at 176 C. The hydrolyzed product was extracted with 50% by volume of methyl alcohol at 55 C. to give a methanol extract containing inorganic phosphorus acids and a lubricating oil rafiinate containing olefin-P 8 product of the formula:

R -ii OII OBI where R is a polybutene radical of an average molecular weight of 940 which had a Neut. No. of 22.6. For a thiophosphonic acid of the formula:

i R 1|OH OH the wt. percent sulfur in said rafiinate is theoretically 1.29. The wt. percent sulfur found was 0.51 indicating X in the above formula is a mixture of sulfur and oxygen.

Example 11 Polybutene (940 M.W.)thiophosphonic acid prepared as in Example I in the amount of 496 grams (0.2 mole based on Neut. No.) was charged to a 1 liter, 3-necked flask equipped with a stirrer, dropping funnel, reflux condenser and a thermometer immersed in the acid. The

' acid was heated to 93 C. and 39 grams (0.3 mole) of wherein R is a radical derived from polybutene having an average molecular weight of 940 and X is a mixture of sulfur and oxygen. This product analyzed as follows:

Description Calculated Found Hydroxyl No 19. 3 16 N eut. No 0 0. 42 Phosphorus, Weight percent l. 2 1.0 Nitrogen, weight percent 0. 48 0. 42

Example III 248 grams (0.10 mole based on Neut. No.) of polybutene(940 M.W.)thiophosphon-ic acid prepared as in Example I was charged to a 1 liter, 3-necked flask equipped with a stirrer, dropping funnel, reflux condenser and a thermometer immersed in the acid. The acid was heated wherein R is a radical derived from polybutene having an average molecular weight of about 940 and X is a mixture of sulfur and oxygen. This product analyzed as follows:

Description Calculated Found Hydroxyl N 24. 24 N eut. No 0 1. 6 Phosphorus, weight perce 1. 13 0.93 Nitrogen, weight percent 0. 61 0. 74

Example IV Polybutene(940 M.W.)th-iophosphonic acid prepared as in Example I was charged in the amount of 496 grams (0.2 mole based on Neut. No.) to a 1 liter, 3-necked flask equipped with a stirrer, reflux condenser and a thermometer immersed in the acid. The acid was heated to 93 C. and 43 grams (0.23 mole) N,'N bis(2,3epoxypropyl) butyla-mine was added dropwise to the acid. The reaction was continued for a period of 2 hours whereupon the reaction mixture was stripped with nitrogen of excess epoxya-mine at 93 C. under 1-2 mm. Hg pressure. The residual product was shown by analysis to consist essentially of N,N-bis(3-polybutenethiophosphonxy-2-hydroxypropyDbutylamine of the formula:

where R is a radical derived from polybutene having an average molecular weight of about 940 and X is a mixture of sulfur and oxygen. This product analyzed as follows:

Polybutene(940 M.W.)thiophosphonic acid prepared as in Example I was charged in an amount of 496 grams (0.2 mole) to a 1 liter, 3-necked flask equipped with a stirrer, reflux condenser, dropping funnel and a thermometer immersed in the acid. The acid was heated to 93 C. and 45 grams (0.22 mole) of N,N-bis(2,3-epoxypropyl)an iline was added dropwise to the acid reactant. The reaction was continued fora period of 2 hours whereupon the excess epoxy compound was stripped from the reaction mixture at a temperature of 93 C. under l-2 mm. Hg pressure. The residual product was shown by analysis to consist essentially of N,N bis(3 polybuitene (9*40 M.W.)thiophosphonoxy-2-hydroxy propyl)aniline of the formula:

OH OH wherein R is a polybutene radical having an average molecular weight of about 940 and X is a mixture of sulfur and oxygen. This product analyzed as follows:

Description Calculated Found Phosphorus, weight percent 1. 15 1.0

y oxy No 37.8 34 Neut. N 0 2. 2 Nitrogen, weight percent 0. 54 0.72

Example VI This example illustrates the lubricant compositions of the invention and the outstanding detergent properties of the thiophosphonoxy hydrocarbylamines and lubricant compositions thereof.

In the well known CLR Sludge Engine Test an SAE 10W-30 motor oil containing 3-polybutene(940 M.W.) thiophosphonoxy-Z-hydroxypropyl-diethylarnine of Example H was tested. Oil A is an example of the lubricant of the invention.

Composition: Oil A Refined paraflinic distillate oil wt. percent (visc. SUS at F-100) 90.94 3 polybutenethiophosphonoxy 2 'hydroxypropyl diethylamine 1.85 Barium c alkylphenolate, wt. percent 1.75 Zinc isopropyl methyl isobutyl carbinyl dithiophosphate, wt. percent 0.88 Mineral oil concentrate containing 25 wt. percent of a copolymer of mixed methacrylate alkyl esters in which the alkyl group range from butyl to octadecyl, wt. percent 4.00 CO neutralized sulfurized basic barium sulfonate (0.08% Ba), wt. percent 0.58 Dimethylsilicone anti-foam concentrate, p.p.m. Properties Oil A: Results Viscosity (SUS):

At 100 F 307 At 210: F. 59.5 Viscosity Index 129 Pour Point, F. 45 Barium, wt. percent, (0.38 calc.) 0.40 Zinc, wt. percent (0.10 calc.) 0.11

A blank was also tested which was essentially identical to the above formulation except the diethylamine compound was deleted.

The CLR Sludge Engine Test results for the above formulations are as follows:

CLR Sludge Engine Test 1 Test Time, Hours Oil A s -p s 1 Sludge free oil rating=10.

As can be seen from the above the thiophosphonoxy hydrocarbylamines of the invention substantially inhibit the formation of the sludge in engine oils.

We claim:

1. A lubricating oil composition comprising as the major component a lubricating oil and between 0.2 and 10 wt. percent of an additive selected from the group consisting of thiophosphonoxy hydrocarbylamine and a mixture of said thiophosphonoxy hydrocarbylamine and the corresponding phosphonoxy hydrocarbylamine, said thiophosphonoxy hydrocarbylamine of the formula:

where R is selected from the group consisting of alkyl, phenyl, alkylphenyl and phenylalkyl of from 1 to 20 car'- bons, R and R are selected from the group consisting of hydrogen and alkyl of from 1 to 6 carbons, R is a monovalent hydrocarbon derived from an aliphatic polyolefin having an average molecular weight between 250 and 50,000, X is sulfur and y is an integer of from 1 to 2, inclusively, said mixture consisting of a major portion of said thiophosphonoxy hydrocarbylamine and a minor portion of said corresponding phosphonoxy hydrocarbylamine where X is oxygen.

2. A lubricating oil composition in accordance with claim 1 wherein said lubricating oil is a mineral lubricating oil having an SUS viscosity at 100 F. between 50 and 1000.

3. A lubricating oil composition in accordance with claim 1 wherein said lubricating oil is a mineral lubricating oil having an SUS viscosity at 100 F. between 50 and 100, R and R are hydrogen, R is polybutene having a molecular weight of 940, y is 1 and said additive is said mixture.

4. A lubricating oil composition in accordance with claim 1 wherein said lubricating oil is a mineral lubricating oil having an SUS viscosity at 100 F. between 50 and 1000, R is phenyl, R and R are hydrogen, R is polybutene having a molecular weight of about 940, y is an integer equal to 1 and said additive is said mixture.

5. A lubricating oil in accordance with claim 1 Wherein said lubricating oil is a mineral lubricating oil having an SUS viscosity at 100 F. between and 1000, R is butyl, R and R are hydrogen, R is polybutene of a molecular weight of about 940, y is equal to 2 and said additive is said mixture.

6. A lubricating oil in accordance with claim 1 wherein said lubricating oil is a mineral lubricating oil having an SUS viscosity at F. between 50 and 1000, R is phenyl, R and R are hydrogen, R is polybutene of an average molecular weight of about 940, y is equal to 2 and said additive is said mixture.

References Cited by the Examiner UNITED STATES PATENTS 2,765,276 10/1956 Van Winkle et a1. 2S2-46.7 2,847,442 8/1958 Sallmann 25249.9 3,014,910 12/1961 Birum 25249.9

DANIEL E. WYMAN, Primary Examiner.

LOUIS G. XIARHOS, Assistant Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent N00 3, 259, 580 July 5 1966 James M Petersen et alt It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 2, line 24, for "sulfa" read sulfur lines 31 t 33, strike out "reactent Nosr 2 95l,835 and 2,98%512, removal of the inorremoval of the inorganic phosphorus acids. and insert instead reactant A number of different procedures are available for removal of the inorganic phosphorus acids -;line 3 for "remroval" read removal line 39, for "Rm 0 Lacoste" read R. Go Lacoste line 40, for "3,135, 729;" read 3,l35,729, column 3 line 17, for "lubrication" read lubricants column 4, lines 54 to 57, the formula should appea as shown below instead of as in the patent:

Signed and sealed this lst day of August 196? (SEAL) Attest:

EDWARD Mr FLETCHER, JR EDWARD J I BRENNER Attesting Officer Commissioner of Patents 

1. A LUBRICATING OIL COMPOSITION COMPRISING AS THE MAJOR COMPONENT A LUBRICATING OIL AND BETWEEN 0.2 AND 10 WT. PERCENT OF AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF THIOPHOSPHONOXY HYDROCARBYLAMINE AND A MIXTURE OF SAID THIOPHOSPHONOXY HYDROCARBYLAMINE AND THE CORRESPONDING PHOSPHONOXY HYDROCARBYLAMINE, SAID THIOPHOSPHONOXY HYDROCARBYLAMINE OF THE FORMULA: 